XML_SetDefaultExpandInternalEntities?

Hello!

I'm trying to port a piece of software (tclxml's tclexpat.c) to use the modern 
expat-2.x instead of the ancient version, that's bundled with tclxml.

It almost works already, except for the missing function:

	XML_SetDefaultExpandInternalEntities()

tclxml is supposed to allow to alter an existing parser switching the 
expansion of entities on and off on the fly:

  case EXPAT_DEFAULTEXPANDINTERNALENTITIES: 
    if (Tcl_GetBooleanFromObj(expat->interp, valuePtr, &bool) != TCL_OK) {
      return TCL_ERROR;
    }
    XML_SetDefaultExpandInternalEntities(expat->parser, bool);
    break;

Unfortunately, the function is not present in the expat-2.0.0 -- it used to 
follow XML_SetDefaultHandlerExpand (which is still there) in xmlparse.c.

What's the right replacement? Thanks!

	-mi